Climax Metal Products - 1" Bore, Steel, Set Screw Shaft Collar - 87986642 - MSC Industrial Supply
Climax Part C-018-A, Aluminum, Set Screw Collar, 3/16 inch bore, 7/16 inch OD, 1/4 inch Width, 8-32 x 1/8" Set Screw: Shaft Collars: Amazon.com: Industrial & Scientific
Shaft collar - Wikipedia
0.15625" (5/32) Steel Set Screw Collar - ServoCity